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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ac6030a90494166f5b301bbae0d6c3412a163667546a27b383e3a9f33be84f' 
  AND token = '6MM/UBx5vEFugCtC17bNAaLsjoQCSZCT9jwnjgIbfXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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