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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae23eba5d02617c7a994974ea0a979f0abb9ee58641d4a15513661979056547c' 
  AND token = '5oCz1lVoe5VRMT0xvl6RAgVO7L9u8I7K4MdDcs65FVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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