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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54f97997d849049997a38be47e17da6132c6c91f5a07d2d6e766c6977d14ff0' 
  AND token = '4aOoQvf3JN/6hTcJNNS8bFal2DdvwOpT07SgLz2uAIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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