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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c439e1076cd90ce6b26eebbce16e23f44ec31c91244fad8bcc3f3785c2100fe1' 
  AND token = 'CjaIpFJTNunE+AtzCeFQ8SAdOE3+zXM+KStjE9Q9qiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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