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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9232d95a0a6459fd182bcc68f36a9278291bf0e01cba7ca455bc9f5fe2173f7' 
  AND token = 'e3KZJe72LyExfB+FFh+NnNFJO/uuaEJcPx+6hDK/Rks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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