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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9effa7232707ee084409060269aad6866eed3b9be492a08d518586ba3c818179' 
  AND token = 's36QpUN85GX5DbGEQcu6vysAyZtlNBTHsP2T9OQO+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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