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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d201745059b5bf202da93d2d61ba9fe51f9631f55f800e7c5669095b902f123' 
  AND token = 'SN/FfoxtVHe3Hrs7ekXM7qNAqrVzT5tQ3AmaRv3jiYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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