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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaff36799e882dcbbb274bbf2153e490f465f0114d937ba3ea521b3ea2b1d20' 
  AND token = 'qccA8KIfWRLOux7l4/LbjDsUk6f/oSg7fRfZ9jFgka0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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