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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431b06766a652e000c95b26c7cf18248da096441029aa8a9555bd2be8cb03a23' 
  AND token = 'Trg7VPi4/3m9c0vzn/ynNHO8lPcqBCsbNSgEB0RAhQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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