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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe9093e4fc5f53ba50340a3b2a73c52b5ef268ea769a7d5fc93ab1339584b46' 
  AND token = 'nygKzSUmh7wj3Qe01roLgL11A4AH8dOoDyXzKc4gPo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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