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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbea926274bafd917e3638b942aa2966645fb1cd14dc062fb5222f94fc84603' 
  AND token = 'Ykc9/j27WNtitDiWcYW/WbNpU8Cppd5IGX/Uj9/VCvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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