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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b919ca3dbd33fe58c7716f9d42435b25034f03e49839216f5b5f120b47eff57' 
  AND token = 'W7fpRMugSgBvgmxeMT+bossuXaFbejli+9VJT1ZM+3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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