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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f30195c1764c2ee423ae48613c36d7bfc30e3d672507d1fb0dd501fd7d1827' 
  AND token = 'rj6bd1nEw7R4k9KRNUptHgdSYWyrHIXO4fjOcIluMOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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