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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f61f27b15668e7d25c1c3fe90eb802cc1875223b0e865741d293b5a2f7761e' 
  AND token = '9bgoGv71ndEkdDF8gZG/ukMPdLvJgk8HabXucdpcf40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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