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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd133bdb88e8d28c968b6afcada35883cfe8d2401d47f4e915e1240022232cab' 
  AND token = 'nd5bAL6/pjQ5NsnPn5ikSNc1b+6/CgqJ46LICw9q4HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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