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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc40c80762468ef02623db876d05bbf5d9e7e9043395b57e0806be2583d84789' 
  AND token = 'E/jA7lB5XP3aF2yTpQgyDCwScM/Ah/AEn41pHL0rNSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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