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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6953c0e7559a8c5e064b088b7c08929308cfca753d6438f5817afb27bbee3a17' 
  AND token = '5cW16rKZABfoXcEMJh2kZX3ZyNKN9tjseP0okE81Yl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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