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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b8bf7c8493a0aabc8d9038631d5f722a00cc8ef0feb379d085a3b2b319737c' 
  AND token = 'rDOpHLp9g68YM99+BMjoQG2ARwMNKn87d5B6Hwq1PMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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