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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9f9c734f76ff95038d01a205fe4aaac7d9455ad9b399f1935aa3dd43ab2aad' 
  AND token = 'ndqZvY0+z2KB99dBaStn9TUlwElQWlrPRi8kBce2/tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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