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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf479f2bf1b5b6801d8a3c3d5bacc2de0b55e36bc5105a569b1b009f1ddd8392' 
  AND token = '8GamBi8kPHgRZA+F/Sk3LraE4QerGFWXLzfO4hf9aJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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