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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08309b4007f53991e56c3f94b5392abc7c01f2fbe4e69e3c6c8f0bb85cbdb0d5' 
  AND token = '/uepB1Sfn5q09uzwBOh+CO66pbf43dgx1Ed01Fmrdaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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