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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1c86ba6301fefd6d575f4c1547c4b14901b290ec8e897dcb4718c6c11502ff' 
  AND token = '6cah4arGAV2mkMCVGwPVeQRCP/LpwEUteVdQLGiwCtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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