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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2512ed3dddfadbaf7041e753d2db9f4cd0fe5dc7af8927a351c158df36425acd' 
  AND token = 'paAILpInlL2615QyhwoV8BZz0KNPpW1Sis1FvAKjeKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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