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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9051d4e216ba3d7c849bcd3a4b4fcf3e828308eda98cafdce158814592f480' 
  AND token = 'YJaGxGH21V6UP/1YNLpLROJlGbl1DxzpTt92iiuuhe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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