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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a45a2c2dca962b9fc3ad1d240fc24c889d0968514d6fcfd232ab09eaf97cf8e' 
  AND token = 'zUgYQSlB1gSjHdIt0eMhkAAQWZYhJ4TwssIEg+macEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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