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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9f5ba49dd2294e937a993f5d087c26eb2159be2a2a74d18de80919ec6ecbd7' 
  AND token = '9x1ZScC1NtJBXjWQcmSHXXe24LewSduczZW5ihbcDE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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