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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc9dce412316c9c0e7e6ad8e46fe791f1ce809b5294cc10ac40efad6868f2c4' 
  AND token = 'W5XcVXEpIgEZlDC33Uh8xfxamgdEhhTl5VbSxA9p0EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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