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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db174fbb8ed4da9d43736253a9c66f560c77149df551ad33a100f8faca70280' 
  AND token = '+KJTQpggzuc1KP03XZIGaIyzk16hznDVE/De8meHtNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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