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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c799be940df87e5022e81a97ed43a60fa4f02ec0d3f78e6aedeb4c4bf87c45df' 
  AND token = '8m1Oue1gRq1K6UNbLVZ77Zpkr+aeG4BdDy0XIndxCLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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