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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c9ae0ea265c0f4c9f46f56df4f1122c8d171de7bb6127fdbf7542bc5c1cba1' 
  AND token = 'Qa8TTc1pTKAWSBFC7bg617WNvFWdOIDMU00uECXqwzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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