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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe91427cf64009d3a9cfbff2dfbe307d21f4cef44b702f03281bd2232e40240' 
  AND token = 'GivWIXYCu6GpG8NcxpxlwfuYAhYaYUbTiUYiu02DqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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