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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e55c3c0797be514c5af02ca44d32a32f76b5562368360fb8f8cf817390ef4b5' 
  AND token = 'MH3xROr5jefZUlvqlsQpEW1xavM4d3BsER+RTqJXOaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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