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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca77f6af5c3b057cf839de623849280d3549725834224c681d1053d74db7361' 
  AND token = 'kRny8JvfOKjKYAeDtL03Hl+yhU5Rthd0nutfQ1zrEFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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