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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c6c3053e85030eda68c0fe0ca24c20fa4bf9fd4a4d1ec0e3ebb5123f1d0a7c' 
  AND token = '+4gh/dgg0C/I9gfOkNIQCvCuOwuNHIFW9L67xQmEbjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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