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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9531e46b9094f5257426d78f87be49b3de1e96474ce208355365dcc79e12092f' 
  AND token = 'Z9jWUKrq94kQcTwEMjGviCjvl3Qk7rp2WIBLK9ze82c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}