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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6ae52982ac9404a826736549b2d8f86d81c23996e4a7c3d582a58fcf5adfcd' 
  AND token = '4MD/onSp27gB/5qSBHAGcuD2jd1K9G1NXUrWI06wAy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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