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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fa89d82bf116b2ecd29dad4eeee3cf8448ac5191e100e44cc58bc0f08775aa' 
  AND token = 'pxKVfsriDAQHHa042EqYIIkWkFyex3Sdu1ZVVp0NK6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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