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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51935c74e025c2db001db0b231ed29d410e2adc4a424214dacf68f4f09120e2' 
  AND token = 'WaT8+yRnbWjUfyvOhMGE4makuxEKz4ChAF6je3gznVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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