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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f981b34806f142a7821e0d1521ca04a44c426404a6513ab38cc34a08d9876ab' 
  AND token = 'Oq3yPSEjDMS5otSJk5HAKOUk+X019mssFDbmNC99eL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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