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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d38c1fdd300feb600db5b8ae19fb4f18068cfa63f8b8349b3e9514a35207b0' 
  AND token = 'h3B1svf3dZZ7syJ4l3nrQaYQwOLPrZDmz4Wpy8aPS/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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