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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03180fb271b3a039ece5e05501c25e520059456c98a64f2ca63cdcf36004d480' 
  AND token = '9xAPy/WSfiHSQLUx6jvpDq9HtMg8/Rht7Dg4weJIegw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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